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Windows 7: Explorer.exe crashes, error 0xc0000005

Hi all, hope you can help. My computer has recently started to crash explorer.exe and I don't know why. I am not too technically minded so reading a dump file means nothing to me. I have attached a copy of the latest dump file if it helps.

*** ERROR: Symbol file could not be found. Defaulted to export symbols for KERNELBASE.dll -
*** ERROR: Symbol file could not be found. Defaulted to export symbols for kernel32.dll -
*** ERROR: Symbol file could not be found. Defaulted to export symbols for ieframe.dll -
*** ERROR: Symbol file could not be found. Defaulted to export symbols for shell32.dll -
*** ERROR: Module load completed but symbols could not be loaded for explorer.exe
*** ERROR: Symbol file could not be found. Defaulted to export symbols for duser.dll -
*** ERROR: Symbol file could not be found. Defaulted to export symbols for msvcrt.dll -
*** ERROR: Symbol file could not be found. Defaulted to export symbols for msiltcfg.dll -
*** ERROR: Symbol file could not be found. Defaulted to export symbols for ehSSO.dll -
*** ERROR: Symbol file could not be found. Defaulted to export symbols for AltTab.dll -
*** ERROR: Symbol file could not be found. Defaulted to export symbols for FXSST.dll -
*** ERROR: Symbol file could not be found. Defaulted to export symbols for GdiPlus.dll -
*** ERROR: Symbol file could not be found. Defaulted to export symbols for msvcr71.dll -

I can't help much but this could be a corrupt file in the operating system. I see you have Win 7 Ultimate but only the 32 bit version installed. As you have 8GB of Ram installed you can only use 3.5GB hereby wasting 4 Gb RAM. Perhaps your copy of Ultimate is corrupt. Where did it come from?

Thanks Mitchell65 for a reply. I bought the copy of Win 7 Ultimate from Amazon, full package, boxed item. I have been toying with the idea of re-installing as the 64bit version that also came in the box, but I have so much software to reload, i have been a little hesitant. Being self employed, I can't have the computer down for too long.

hmm..interesting. I did buy my copy from pre-order Sold by: Amazon EU S.a.r.L. ordered on the 18th Aug 2009 and dispatched on the 20th Oct 2009 when Microsoft first released Win 7. What do you recommend?

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it happens in...

BSOD: Lots of random crashes (0xc0000005\0x00000000\0x1000008e)Hello
Thanks for reading this and hopefully pointing me in the right direction
I have attached my:
Mini Dump files
Hijackthis
Driverlist
System info
And a few other useful log files that I have put together that I hope will help
For a Few months now My Computer has been rebooting due to...